Near Tokyo, a house with a private museum recreate an ancient hill for one to reside in. Its architectural form is structured around harsh local climatic conditions in the likes of strong winds, north and west exposure and burning hot summers. This is thanks to its roundness, its slit-like openings which provide double façade and its patio which allow one to enjoy the sun and protection from storms. Its semi buried position offers insulation and thermal inertia making it cool in summer whilst warm in winter.